The Lab Leak Theory Doesn’t Hold Up

When HIV/AIDS emerged in the 1980s, it was alleged, with a little Soviet help, that the virus had been developed in an American lab. Between Washington’s inaction on the epidemic and its sordid past of shady experiments, proponents said the theory couldn’t be dismissed out of hand.

After many early cases of tick-borne Lyme disease were first identified around Long Island Sound, it was deemed too much of a coincidence that the U.S. military’s Plum Island animal research lab sat on an island in the sound itself.

When SARS emerged in 2003, so did fears of the...